KR0129533B1 - Electromagnet with permanent magnet held by a cage - Google Patents

Abstract

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Description

Electromagnet with permanent magnet held by the cage

1 is a cross-sectional view showing a half of an electromagnet according to the present invention.

2 is a perspective view of the outer pole piece.

3 is an enlarged perspective view of one of two cages.

4 is a longitudinal sectional view of a fixed magnetic device.

5 is a cross-sectional view taken along the line V-V in FIG.

6 is a perspective view of the inner pole piece.

＊ Explanation of symbols for main parts of drawing

11: winding-up part 11a, 11b: end flange

12: core 14a, 14b: pole flange

16: inner pole piece 17: permanent magnet

36: lobe 60: cage

61: outer pole piece 63, 64: recess

75, 76, 77: transverse member 80: hook

82,83: Flange

FIELD OF THE INVENTION The present invention relates to polarized electromagnets, and more particularly to a device for holding a permanently polarized magnet and various parts mechanically connected thereto.

Polar electromagnets are known from FR-A-2,358,006, in which a permanent magnet is inserted between an inner pole piece relatively close to a winding and an outer pole piece far from the winding. An axially movable magnetic core in the winding has pole flanges at each end, at least one of the pole flanges having two pole faces respectively belonging to the inner pole piece and the outer pole piece. It is arranged in the air gap between them.

Depending on whether a bistable electromagnet or a monostable electromagnet is desired, the other pole flange may be in another air gap between the inner and outer pole pieces, or alternatively one or two poles of one pole piece at a position spaced apart from the other pole pieces. It extends only near the pole surface.

FR-A-2,358,006 relates primarily to magnetic circuits that perform certain functions in principle. However, there are some problems in economically constructing the circuits. Adhesive connections are not easily precise and require auxiliary air gaps. Riveted mechanical fixation systems are expensive to provide precision and affect magnetic flux.

Accordingly, it is an object of the present invention to provide a simple, effective and precise device that is easy to assemble and that deleterious effects on the magnetic field are avoided, affecting the assembly of two pole pieces and a permanent magnet in a designated type of electromagnet.

Accordingly, the present invention provides a first magnetic device including an induction winding portion, a core wrapped by the winding portion, an inner pole piece relatively adjacent to the winding portion, and an outer pole piece relatively far from the winding portion. 2 a magnetic device and a permanent magnet inserted between the outer pole pieces and the inner pole pieces, wherein the first and second magnetic devices are movable between each other, and the core is formed between the inner and outer pole pieces. An electromagnet having a pole flange disposed in an air gap on at least one side of the winding.

According to the invention, the electromagnet is characterized by a nonmagnetic cage snapped onto the outer pole piece, the nonmagnetic cage being positioned for lateral movement with respect to the magnetic axis of the permanent magnet. And each recess formed by the retaining and retaining device is provided for the permanent magnet and the inner pole piece.

The assembly method by snapping makes it possible to precisely position easily. Thus, the cage can be precisely positioned relative to the outer pole piece. Subsequently, precise positioning of the inner pole piece may occur.

The cage holds and positions the pole pieces and the permanent magnets mutually with respect to the transverse displacement with respect to the magnetic axis of the permanent magnets. According to the present invention, it has been found that the movement in the magnetic direction is effectively opposed by the attraction force generated on the respective pole pieces by the permanent magnet.

In a suitable embodiment of the invention, opposite the side of the inner pole piece spaced from the air gap, the cage is in magnetic contact with the outer pole piece such that between the second pole flange and the outer pole piece of the core, i. Lee lobe for a magnetic lobe forming with the transverse region of the outer pole piece a possibility of relative movement between the position held with respect to the outer pole piece and the position where the second pole flange is adjacent to the lobe. To form a seth.

Thus, a monostable electromagnet is provided. In fact, at both positions of the moving device, the second pole flange is magnetically connected to the outer pole piece. The permanent magnet contacts the moving device in a position where the magnetic circuit of the permanent magnet is closed, eg the first pole flange is in contact with the inner pole piece, and the magnetic circuit is then the core, the first pole flange, the inner pole piece, the permanent magnet, the outer pole piece and There is a tendency to keep it in position through the second pole flange.

In this embodiment, the cage holds the lobe in a suitable position with respect to the outer pole piece. This allows the outer pole piece and the lobe to be provided from simple primary materials, such as sheet metal, respectively. Instead, FR-A-2,358,006 discloses providing the outer pole piece and the lobe as a single piece or assembling them to form a single piece that is complex in structure.

Other features and advantages of the invention will be apparent from the following description.

In the embodiment shown, the electromagnet has a winding 11 in which a turn is formed on the body 11c with the multi-head flanges 11a and 11b.

The first magnetic device or the moving device has a magnetic core 12 which slides axially in the winding portion. The core 12 holds the first pole flange 14a beyond the flange 11a of the winding and the second pole flange 14b beyond the flange 11b.

The electromagnet also has a second magnetic device or a fastening device, which has an inner pole piece 16 and two opposing faces 30a, 30b relatively adjacent to the winding part 11 with a central opening 62a, 62b) with an outer pole piece 61 in the form of a rectangular frame, the ends 12a, 12b of the core 12 positioned below the pole flanges 14a, 14b having the central openings 62a, 62b. The outer pole piece 61 in the form of a rectangular frame, the ends 12a, 12b of the core 12 positioned below the pole flanges 14a, 14b slidably engage within the central openings 62a, 62b therebetween. do. The outer pole piece 61 is made of a strip of magnetic metal bent four times at 90 degrees, so that the two ends are in contact with each other on a plane 88 through the axis VV 'of the winding. Thus, the face 30a is constituted by two half faces 30'a and 30a. The faces 30a, 30b are perpendicular to the axis VV '. The other two sections 29 are parallel to the axis VV 'and also parallel to the plane of symmetry of the electromagnet passing through the axis VV'.

The face pivoted towards the axis VV 'of each section 29 of the outer pole piece 61 is adjacent to one of the pole faces of each permanent magnet 17, for example, to the S pole face. The other magnetic pole face of each magnet 17 pivoted toward the axis VV 'is adjacent to each inner pole piece 16.

Moreover, the face pivoted toward the axis VV 'of each section 29 of the outer pole piece is made of magnetic material and extends toward the axis VV' between the magnet 17 and the face 30b of the outer pole piece 61. Magnetic contact with the polarity lobe 36. Each polarization lobe 36 is a parallel hexahedron shaped parallel to the plane of face 30b. The free distance between the face 30b and the face 36a of the polarized lobe 36 pivoted towards it is such that the face 30a and each inner pole piece 16 are positioned with respect to the face 30a. Is equal to the free distance between the end faces 27a. Each lobe 36 is spaced apart from the magnet 17 and the adjacent inner pole piece 16.

The pole flange 14a of the core 12 is engaged in two air gaps 25a respectively formed between the end face 27a of the inner pole piece 16 and the face 30a of the outer pole piece 61. The other pole flange 14b of the core 12 is disposed in the air gaps 25b provided by the face 36a of the lobe 36 and the face 30b of the outer pole piece 61, respectively. Moreover, the space between the pole flanges 14a and 14b is such that the pole flange 14b is in contact with the lobe 36 when the pole flange 14a is in contact with the face 30a, and the pole flange 14a is formed. The pole flange 14b is configured to be in contact with the face 30b of the outer pole piece 61 when is in contact with the face 27a of the inner pole piece 16.

Thus, when the windings are excited, the core 12 has a core 12, a pole flange 14a, an outer pole piece 61, a lobe 36, and a pole, considering the current flow direction with respect to the coil winding direction. It is squeezed toward the above-described first position (the position shown in FIG. 1) in which a closed or nearly closed magnetic circuit through the flange 14b is formed. The magnetic circuit does not pass through the permanent magnets 17. For this reason, when the winding part 11 is de-excited, the permanent magnet 17 is formed by the first pole flange (while the second pole flange 14b is in contact with the face 30b of the outer pole piece 61). 14a) returns the moving device toward the above-described second position in contact with the inner pole pieces 16, such that the magnetic circuit is magnetically mounted in parallel with each other similarly to the inner pole pieces 16; Are closed through them.

According to the invention, one of the sections 29 of the outer pole piece 61, the magnet 17, the inner pole piece 16 and the corresponding lobe 36, Each assembly consisting of a fixed cage 60 is provided.

Each cage 60 consists of two longitudinal walls 73, 74 that are parallel to the axis VV ′ and perpendicular to the plane of the sections 29. The free space between the walls 73, 74 is equal to the width p (FIG. 5) of the sections 29 of the outer pole piece 61. In operation, walls 73 and 74 are located on opposite sides of the corresponding section 29. The outer edges of the walls 73 and 74 are flush with the outer face of the section 29. Coplanar surfaces 85, 86 ′, 87 of three transverse members 75, 76, 77 connected to walls 73, 74, respectively, are adjacent to the inner side of the section 29.

The two end crossing members 75, 77 are in contact with the recesses 63, 64 of the outer pole piece 61, respectively, to snap the cage 60 to the inner face of the section 29 in the position described above. It holds each hook 78, 80 designed to interact.

The hook 78 received by the crossing member 75 is a positioning lug towards the wall 30a. The lug is at the two ends of the edge between the corresponding section 29 and the face 30a. In the recess 63 provided in the pole piece 61, they are coupled without play across the axis VV '. On the side spaced from the face 85, the lug 78 is designed to be supported against the inner face of the face 30a to precisely define the position of the cage with respect to the outer pole piece in the VV 'direction. It is provided.

Each hook 80 forms a U-shape that is open toward the face 30a with the transverse member 77 holding it. Each hook 80 is designed to engage in a recess 64 at the edge of the section 29 such that the end portion of each hook 80 is supported on the outer surface of the section 29 with a U-shaped central zone. 81 is elastically supported with respect to the corresponding edge of recess 64 as the outer side to elastically compress the cage such that shoulder 79 is supported against the face 30a.

The crossing members 75 and 76 form a recess therebetween with the same dimensions as the permanent magnet 17.

Moreover, the intermediate crossing member 76 is elongated toward the axis VV 'by a wing 76a extending to the inner edge of each longitudinal wall 73, 74. The inner pole piece 16 is arranged between the wing 76a and two flanges 82 and 83 opposing each other, and the longitudinal walls 73 and 74 between each inner edge and the transverse member 75. Is supported by. The free space between the vanes 76a and the flanges 82, 83 is the same as the corresponding dimension of the pole piece 16. However, the pole piece 16 faces the projection 30a so that the aforementioned outer surface 27a is flush with the outer surfaces of the flanges 82 and 83, and the protrusions coupled between the flanges 82 and 83 27; 4 and 6).

In order to position the pole piece 16 more effectively, the pole piece has two opposing ears joined in corresponding recesses 84, 86 (FIG. 3) of the inner edge of the transverse walls 74, 73 on the longitudinal edge. (91, 92; FIG. 6). If the positioning devices are to be provided, the flanges 82, 83 can be omitted and the inner pole piece 16 can extend the full width up to the height of the corresponding edge 71 of the side walls 73, 74. .

The section 29, the magnet 17 and the inner pole piece 16 all have the same width as the free distance between the walls 73, 74 and are simply stacked between the walls. The walls 73, 74 and the transverse members 75, 76 parallel the section 29, the magnet 17 and the pole piece 16 to the magnetic axis of the magnet 17, for example parallel to the plane of symmetry of the electromagnet. It does not determine the location of each other except for one movement. Therefore, the magnet 17 prevents the pole pieces 29 and 16 from leaving the magnet 17 by the attraction force. The height of the walls 73, 74 is such that during operation the inner longitudinal edge of the wall is flush with the inner face of the pole piece 16.

Moreover, the cage consists of a simple parallel hexagonal shape of magnetic material between the transverse members 76, 77 and forms a recess 72 for receiving the lobe 36 during operation. The lobe 36 provides a surface extending along the inner edge of the wing 76a and along the inner side of the pole piece 16 during operation towards the axis VV '. In order to keep the lobe 36 in the position where the side pivoted towards the section 29 is firmly attached to the section, each longitudinal wall 73, 74 is formed along the inner edge with a polarized lobe ( Support the snap-sealed lugs holding 36). The transverse member 76 and the wing 76a form a partition wall between the lobe 36 on one side and the magnet 17 and the inner pole piece 16 on the other.

To reduce the size, the cage 60 maintains the lobe 36 such that the air gap face 36a is substantially positioned in the plane BB '(FIG. 4) of the flange 11b (FIG. 1), and the inner pole piece. 16 is maintained such that the air gap surface 27a is located in the plane AA '(FIG. 4) of the other flange 11a (FIG. 1). Thus, the remarkable empty spaces in the electromagnets are spaces required for the movement of the pole flanges 14a and 14b.

Preferably, the cage 60 is made of a single piece molded from a plastic material. However, at least certain parts of the cage can be made from a plate of nonmagnetic metal, in particular nonmagnetic metal.

Of course, the present invention is not limited to the above-described embodiments.

The invention particularly relates to electromagnets, which are not provided with a lobe 36 and whose inner pole pieces 16 have two opposing air gap faces, one facing the face 30a and the other facing the face 30b. Can be used. In this case, the cage will have the same right part (as shown in the figures) and the left part which is symmetrical with respect to the right part with respect to the plane perpendicular to the axis VV ', but the hook device is shown in FIGS. It remains within the structure shown in the embodiment of FIG. 6.

If the attractive force of the magnet 17 is not sufficient to ensure attachment for movement parallel to the magnetic axis of the magnet, the snap fastening protrusion is stretched along the inner edges of the walls 73 and 74 to form the inner pole piece 16. Can also hold.

Claims (12)

A first magnetic device having an induction winding part, a core wrapped by the winding part, a second magnetic device having an inner pole piece relatively adjacent to the winding part and an outer pole piece relatively far from the winding part; A permanent magnet inserted between the outer pole pieces and the inner pole pieces, wherein the first and second magnetic devices are movable between each other, and the core is disposed in an air gap formed between the inner and outer pole pieces. 10. An electromagnet having a pole flange on at least one side of the winding, wherein the nonmagnetic cage is snapped onto the outer pole piece and comprises recesses in the transverse displacement with respect to the magnetic axis of the permanent magnet. Electromagnet. 2. The electromagnet as claimed in claim 1, wherein the cage as a snap fastening device has a hook engaged in a recess in the outer pole piece. 2. The electromagnet of claim 1, wherein the cage has two longitudinal walls with pole pieces and a permanent magnet stacked therebetween. 4. The electromagnet of claim 3, wherein each longitudinal wall has a recess in which an ear of the inner pole piece is coupled therein. 2. The electromagnet of claim 1, wherein said cage has two transverse members positioned between the pole pieces on both sides of said permanent magnet. The electromagnet according to claim 1, wherein the pole pieces and the permanent magnet do not move with respect to the parallel movement with respect to the magnetic axis of the permanent magnet by the qualification of the permanent magnet. 2. The electromagnet according to claim 1, wherein on the side of the air gap, the cage has two flanges extending mutually to position the inner pole piece with respect to the movement in the direction in which the air gap narrows. 2. The device of claim 1, wherein on the side of the inner pole piece spaced apart from the air gap, the cage defines a recess for the magnetic lobe that is in magnetic contact with the outer pole piece, wherein And an air gap along with the transverse section of the outer pole piece in which a relative movement between the second pole flange and the outer pole piece of the core is present between the second pole flange and the lobe adjacent position. The electromagnet according to claim 8, wherein the cage includes a partition wall disposed between one lobe and the other magnet and the inner pole. The electromagnet according to claim 8, wherein the cage includes a snap fastening device for holding the lobe in a supporting contact with the outer pole piece. 9. The method of claim 8, wherein the induction winding consists of a winding formed between two winding end flanges, the cage holding the lobe such that an air gap surface is located in the plane of one winding end flange, And hold the inner pole piece such that an air gap surface is located in the plane of the other winding end flange. 2. The electromagnet of claim 1, wherein said cage is made of a plastic material.

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